你参考看看……
y=3sin(x/2)(-π/4≤x≤π/4)解析：y=2arcsin(x/3)(-3≤x≤3)～～～～～～～～～～～～y=2arcsin(x/3)y/2=arcsin(x/3)x/3=sin(y/2)x=3sin(y/2)交换x和y，y=3sin(x/2)(-π/4≤x≤π/4)
